Improvement in draft-pipes for heaters



M. A. SHEPARD. Draft-Pipe for Heaters. -No. 204,170. Patented May28,1878.

ATTEST: INVENTOR? Wfiw" I 41% 4, 6% f f UNITED STATES PATENT OFFICE.

MORRILL A. SHEPARD, OF LEBANON, ILLINOIS.

IMPROVEMENT IN DRAFT-PIPES FOR HEATERS.

Specification forming part of Letters Patent No. 204,170, dated May 28,1878; application filed November 16, 1877. v

2 is a detail perspective view of the-draftpipe B.

The drawing shows a fire-receptacle, A, which may be a fire-place,stove-grate, or heater. To it are connected the smoke-pipes O O, which,under my improvement, may be formed into an arch shape, or arranged soas to pass and meander through several rooms, or around, inside,or undera public or private building, and then connect with the draftpipe B, asshown, at the opposite end of which is connect-ed the exit-pipe D.

As soon as a fire is kindled in the fire-box the draft-pipe B receivesthe first heat, and the air inside of the same, by virtue of said heat,expands and rushes out through the exit-pipe D, creating a partialvacuum in the draft-pipe B, which creates a strong draft through the'smoke and heat pipes O C. After this a constant draft is maintained,and the heat distributed Wherever the pipes may pass. 7

The exit-pipe D (or pipes O G,if desired) may pass along and near thefloor, or even down under the floor, and the heati'rom the same may beadmitted to the room above by registers, in order to have convenientheat for warming.

The draft-pipe B may be of anysuitable shape; but I prefer to use a flatoblong pipe,

the advantages of which are, that as the sides of the pipe are closetogether, the air, as it passes through it, will be more thoroughlyheated and its velocity accelerated. This draft-pipe B may be placed atbottom, middle, near the top, or in the drum of the firereceptacle A, inany situation so as to be kept at a higher temperature than the outsidepipes. I The process of draft by the use of the pipe B in my improvementmay be utilized for drawing ofi' and consuming noxious gases.

1 claim as my invention-- 1. The fire-receptacle A, draft-pipe B, smokeand heating pipes O U, and exit-pipe D, all combined substantially asshown and described.

2. The pipe B, attached, as described, in

the most suitable place in a stove or heater,

so that the air within it may be superheated, thereby accelerating thedraft through the pipes C O, with which it is connected, substantiallyas and for the purposes described and set forth.

MORRILL A. SHEPARD. Witnesses: Y ERNST GRAUEL, ADAM TRABAND.

